Dimethylbicycloheptenyl and dimethylbicycloheptanyl derivatives and their use as odorants

A compound of formula (I)

• wherein
• the dotted line together with the carbon-carbon bond forms a single bond or a double bond;
• nis 1 or 0;
• X is selected from —O— and —CH2—;
• and
• R1 is hydrogen or methyl.